JPH0217806B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a page switching device that winds up a plurality of page sheets on a reel, selects a specific page sheet among them, and guides the page sheet to a predetermined position.

Conventionally, this type of page switching device has a plurality of endless belts, for example, two endless belts, which hold the page sheet in the wound state on the winding shaft, and are installed at both ends of the winding shaft. , in the case of three, they were installed at both ends and the center of the winding shaft.

In this structure in which multiple endless belts are installed for holding down, even if there is some variation in the rotational speed of these endless belts, the page sheet will be distorted or misaligned, making it impossible to achieve stable page selection operation. .

The purpose of the present invention is to solve this conventional drawback, and the purpose is to provide a winding shaft for winding up a plurality of page sheets so that their tips are spaced apart from each other by a certain distance, and a winding shaft that rotates the winding shaft. It has a drive shaft for holding the wound page sheet on the winding shaft, and an endless belt for holding down the winding shaft, which goes around the winding shaft and spans the drive shaft. A page switching device that selects and sends out a desired page sheet by rotating it at an arbitrary angle in the winding direction and its opposite direction (feeding direction), characterized in that only one endless belt is installed approximately at the center of the winding shaft. This can be achieved by a page switching device.

Hereinafter, one embodiment of the present invention applied to a page switching mechanism of a multi-item information input device will be described with reference to the accompanying drawings.

FIG. 1 is an external perspective view of a multi-item information input device according to the present invention. It consists of a housing structure in which a metal lid 3 in which a through hole 2 is formed is covered, and a page sheet exchange port 4 communicating with the inside of the housing is provided on the front side. Furthermore, a thin push button switch 5 is provided below each rectangular through hole 2, and is switched by the vertical movement of the key top. (14 keys) and a group of input keys (49 keys in the figure) for inputting information items.

FIG. 2 is a sectional view schematically showing the inside of the apparatus shown in FIG. 1. As shown in the figure, the base 1 on which the lid 3 is covered has a substantially U-shaped cross section, and a push button switch 5 is installed between the opposing side walls 6 (only one side wall is shown in the figure).
A keyboard section 7 is provided with a page switching mechanism 9 mounted behind the keyboard section 7.

The keyboard part 7 has switch parts 5 of push button switches 5 on both sides of the U-shaped hardware 71 at both ends.
A printed board 72 on which 1 is mounted and a printed board 73 on which circuit components such as a keyboard encoder (not shown) are mounted are attached. Further, in front of the printed board 72 is a switch guide plate 74 for guiding the key top 52 to the switch part 51.
However, a page sheet guide plate 75 is attached to the rear of the printed board 73 for guiding a page sheet member 14, which will be described later. Furthermore, the keyboard section 7 is attached between the switch guide plate 74 and the lid 3 with a gap for introducing the page sheet.

On the other hand, the page switching mechanism 9
A winding shaft 91 for winding the winding shaft 91, a drive shaft 92 connected to a stepping motor (not shown) for rotating the winding shaft 91, and a presser member for holding the page sheet member 14 in the winding direction of the winding shaft 91. A shaft 9 for spanning a certain endless belt 93 between shafts 91 and 92
It has 4,95,96. Also, the shaft 96 is connected to the belt 9
In order to keep the tension of 3 constant, it is rotatable about the shaft 97. Further, a guide plate 10 is installed in an inclined manner parallel to the guide plate 75 on the base below the keyboard section 7, and a space between the winding shaft 91 and the guide plate 74 is used for guiding the selected page sheet. Guide plates 11, 12 forming a passage are provided. In addition, the front of the space between the guide plates 10 and 75 is the exchange port 4.
A page sheet member guiding passage 13 whose rear end communicates with the winding shaft 91 is formed.

In addition, FIG. 2 shows the replacement port 4 of the page sheet member 14.
The figure shows a state where it has been introduced into the passage 13.

FIG. 3 is a perspective view showing an example of the page sheet member 14 according to the present invention.
It is formed from 1. On the surface of the page sheet 140, information items (not shown) giving function indications for each pushbutton switch 5 of the input key group B are provided by printing or other means. On the other hand, the base sheet 141 is somewhat thicker than the page sheet 140,
An engaging pin 14 made of a metal material is provided at the end of the beginning of the winding.
2, and on one side are provided a page sheet member identification hole 143, which is a slit-like transparent hole arranged in a row, and page sheet identification holes 144, 145. is formed. And each page sheet 140
As shown in Figure 4, one end surface is attached to the base sheet 1.
41 at fixed intervals. FIG. 5 shows the state in which the page sheet member 14 is wound around the base sheet 141 in a drum shape, and the other end surface of each page sheet 140 is exposed for a certain length in the winding direction. At this time, the exposed length of the other end surface of each page sheet 140 is the same as that of the final page sheet 1.
All a dimensions are the same except for 40″, but
Only the final page sheet 140'', which is covered by the first page sheet 140', has an exposed length of the end surface of dimension b.The dimension b is larger than the dimension a, preferably b=2a. The winding diameter of the base sheet 141 is set so that

FIG. 6 is an enlarged plan view showing the page sheet identification means provided on one side of the base sheet 141 in FIG. 3. FIG. As shown in this figure, the first row of holes 144 for page sheet identification are located on the page sheet 1.
40 and are formed on the same straight line as the attachment position of the page sheets 140 to the base sheet 141, and the second row of holes 145 for identifying the page sheets are located at the center between the holes in the first row 144. It is formed so as to have the same width as the slit.

However, the first hole 145a of the second row of holes 145 located on the end side of the beginning of the roll of the base sheet 141 is formed at the same position as the first hole 144a of the first row of holes 144, and has a slit width wider than that. . Furthermore, each hole 143 for page sheet member identification is the first row hole 14.
A predetermined number of slits are formed at positions corresponding to each of the holes 145, and the width of the slits is wider than that of the first holes 145a of the second row holes 145.

The relationship between the slit hole dimensions of each hole group is "page sheet member identification hole 143>first hole 145a of second row hole 145>first row hole 144=second row hole 145".
holes other than the first hole 145a.
This page sheet member 14 includes each page sheet 140.
A plurality of page sheet members with different information items are prepared in advance, and each page sheet member has a different number of identification holes 143.

FIG. 7 is a schematic diagram showing a state in which the base sheet 141 is wound around the winding shaft 91. In this state, a light emitting element 152 consisting of a light emitting diode (LED) and a light receiving element 154 consisting of a phototransistor are placed on both sides of the base sheet 141. Each facing identification hole 143,
144 and 145 are detected.

Next, an example of the means for identifying selected page sheets and page sheet members is shown in FIG. 8 which is an identification signal generation circuit and signal waveform diagram for explaining its operation.
This will be explained with reference to the figures.

In FIG. 8, 152a and 154a are light emitting elements and light receiving elements for detecting the first row of holes 144 for page sheet identification, and 152b and 154b are light emitting elements for detecting the second row of holes 145 for page sheet identification. Light receiving elements 152c and 154c are light emitting elements and light receiving elements 156a, 156b, 156 for detecting the column holes 143 for page sheet member identification.
156d is an inverter circuit, 157 is an AND circuit, 158 is a D-type flip-flop circuit whose D terminal is held at a constant potential H for temporarily suspending the page pulse generated by the first column hole 144;
159 is a counter circuit that counts the output pulses from 158 using clock pulses of a constant period;
60 is a D-type flip-flop circuit for temporarily suspending the sheet member pulse generated by the identification row hole 143, and 161 is a counter circuit for counting the output signal from 160 using clock pulses of a constant period. Further, in FIG. 9, the pulse waveform A is the output waveform of the inverter circuit 156a, B is the output waveform of the inverter circuit 156b, E is the output waveform of the inverter circuit 156c, C is the output waveform of the flip-flop circuit 158, and D is the AND circuit 15
7 output waveform, F is flip-flop circuit 16
This is the output waveform of 0.

In this identification circuit, the light receiving elements 154a, 15
4b, 154c are light emitting elements 152a, 152b,
The light of 152c is the first row hole 144, the second row hole 14
5. It operates when each hole of the identification column holes 143 is transmitted, and a slit pulse corresponding to the slit width is sent to the inverter circuits 156a, 156b, and 156c. The output terminal Q of the flip-flop 158 is set by sequentially inputting the page pulses shown in FIG. 9A to the input terminal T. Further, the clear pulses (reverse pulse train in FIG. 9B) sequentially input to the clear terminal R via the inverter circuit 156d clear the Q output for each pulse in FIG. 9A,
As a result, output pulses as shown in FIG. 9C are sequentially input to the counter circuit 159 and counted.

Flip-flop 158 is thus set by the page pulse of FIG. 9A, which is set by the page pulse of FIG. 9B.
Since the page is cleared sequentially by the clear pulses, even if page pulses occur frequently (G in FIG. 9A) due to unnecessary external vibrations during page selection, no extra pulses are counted.

Furthermore, when the flip-flop 160 receives the synchronized pulses E and C in FIG. 9 at its input/output terminals D and T, it sends an output pulse as shown in FIG. 9F from its output terminal Q to the counter circuit 161. is counted.

Furthermore, since the first hole 144a of the first hole 144 and the first row hole 145a of the second row hole 145 are at the same position as described above, the light receiving elements 154a and 154b operate simultaneously, as shown in FIGS. 9A and 9B. Pulses H and I are generated, and the pulses H and I cause the AND circuit 157 to send a pulse as shown in FIG. 9D to the counter circuit 159,
161. This pulse is a reset, and the count values of the counter circuits 159 and 161 are reset at a constant cycle and set to the initial state.

The identification signal in this identification circuit is generated when the page sheet member 14 is hooked onto the winding shaft 91 and wound by page selection. One reset pulse sets the counter circuits 159 and 161 to the initial state. From this state, the winding shaft 91 is controlled to rotate several times (two revolutions in this embodiment) until the page sheet section 14 is wound up and the desired page sheet set state is reached. 161 is the output pulse of the flip-flop 160 based on the presence/absence data of the identification column hole 143 obtained in synchronization with the page pulse of FIG. 9A (FIG. 9F is sequentially counted, and the next second reset pulse is applied. The count value until the page sheet member 14 rotates is outputted to an external device as a page sheet member identification signal.This identification signal is always outputted every time the page sheet member 14 rotates once.

Similarly, the counter circuit 159, which is set to the initial state by the first reset pulse, first sequentially counts the output pulses of the flip-flop 158 (FIG. 9C) until the next second reset pulse is applied. This value is output to an external device as the winding state of the hege sheet member 14 (a state in which the page sheet member 14 is completely wound around the winding shaft 91). Then, the counter circuit 159, which has been set to the initial state again by the second reset pulse, sequentially counts the output pulses of the flip-flop 158 until the third reset pulse is applied again, and uses this value as the output pulse of the selected page sheet. It is input to an external device as an identification signal. Also, from this state, the counter circuit 15
9 is a flip-flop 15 until the winding shaft 91 rotates once in the opposite direction to derive the selected page sheet.
The number of output pulses of 8 is counted and this value is input to an external device as a page sheet display state. In this way, the counter circuit 159 sends out the winding state signal of the page sheet member, the identification signal of the selected page sheet, and the display state signal of the selected page sheet, and outputs the selected page sheet identification signal and the above-mentioned counter circuit 161. The external device can identify which type of page sheet member is attached and which page sheet is selected by the page sheet member identification signal generated by the button switch 5
It becomes possible to specify the code signal that is generated when the button is pressed.

Next, the page switching mechanism, which is a feature of the present invention, will be explained with reference to FIGS. 10 to 14.

FIG. 10 is an overall perspective view partially omitting the main page switching mechanism 9. As mentioned above, 91 is a winding shaft, 92 is a drive shaft, 93 is an endless belt, and 94 to 9
7 is a shaft, and 10 and 12 are guide plates. 98 and 99
is a one-way clutch that rotates synchronously with the rotation of the drive shaft 92 in one direction and is free to rotate in the other direction, and is provided at the middle and one end of the drive shaft 92. 100 is a stepping motor, 101 is a seesaw switch for ON/OFF driving of the stepping motor 100, 102, 103, 104 and 105 are gears, 106, 107, 108 and 109 are pulleys, 110 is a recovery coil spring, 111 and 112
113 is a holding plate made of a metal material, 114 is a substrate made of a metal material, 115, 116 and 117
118 is a roller, and 118 is a holding plate 11 for holding the three light receiving elements 154 in a row facing each hole row.
The support plate 119 attached to 1 is a timing belt. The support frame that supports the winding shaft 91 etc. is the first
As shown in FIG. 1, holding plates 11 are provided on both sides of the substrate 114.
1 and 112 are formed by mounting retaining plates 113 upright in the center thereof. In the case of the holding plates 111 and 112, the holes 121 of the holding plates are fitted into the protrusions 120 formed on both end faces of the substrate 114, and then the holding plates 122 are aligned and the screws 124 (10th (see figure). In the case of the holding plate 113, the protrusion 125
This is done by twisting the protruding end after inserting it into the hole 126. Furthermore, through holes 127 and 128 for rotatably supporting both ends of the winding shaft 91 and the drive shaft 92 and a slit 129 for attaching the guide plate 12 are formed in advance in the holding plates 111 and 112. Furthermore, the holding plate 113 has shafts 94, 95, 9.
A hole 130 for fixing the drive shaft 7 and an insertion hole 131 for the drive shaft 92 are formed. In addition, one end of each of the shafts 94, 95, 97 is inserted into the hole 130 of the holding plate 113, and then fixed by caulking or the like, and the pulleys 107, 1 are fixed thereto.
After inserting 08 and 109, the other end is secured with an E ring or the like. Further, a connecting plate 132 is rotatably attached to the other end of the shaft 97 as shown in FIG. The plate 132 is constantly pressed outward in the direction of the arrow by the restoration coil 110 so that the tension of the belt 93 remains constant. After the pulleys 107 to 110 are attached, the holding plate 113 is attached to the base plate 114 as described above.

The structural features of the support frame formed in this way are the holding plates 111, 112, 113 and the substrate 115.
The positioning is performed by butting the cut surface of the material against the material surface, and since it does not involve bending, it can be assembled with high accuracy, and the assembly can be performed efficiently because the protrusion and hole fit together. can.

The drive shaft 92 has a gear 1 at one end as shown in FIG.
03, a one-way clutch 99 integrally provided with a pulley 106 on the outside in the center, and a one-way clutch 98 integrally provided with a gear 104 on the outside at the other end.

As shown in FIGS. 10 and 12 to 14, the winding shaft 91 is made of a metal rod with a hexagonal cross section, with rollers 115 and 116 at both ends and a roller 11 at the center.
7 is installed. rollers 115, 116,
117 is provided with a through hole 133 having a hexagonal cross section at its center, as shown in FIG.
A crescent-shaped groove 134 is formed in which the pin 142 engages, and a notch 135 is formed in a part of the circumference of the roller 117 to allow the pin 142 to escape. Furthermore, roller 1
The outer end of 15 is formed into a cylindrical shape, and a page sheet member identification hole 136 and page sheet identification holes 137 and 138 are formed in a row at regular intervals through the peripheral wall thereof. These page sheet identification holes 137 and 138 are located in the page sheet member 14 described above.
The page sheet member identification holes 136 are located on a horizontal line with the page sheet identification holes 137, and are formed in the same number as the page sheet identification holes 137. .

Therefore, when the base sheet 141 is wound around the roller 115, the page sheet identification holes 13 of both
7 and 144 and 138 and 145 match, and
The page sheet member identification hole 143 of the base sheet 141 matches the page sheet member identification hole 136 of the corresponding roller 115, and the other hole 13
Regarding No. 6, the page sheet 141 is made of an opaque material, so it is shielded from light so that a predetermined page sheet member identification signal can be obtained. After forming such rollers 115, 116, and 117 by resin molding, they are inserted into the winding shaft 91 as shown in the perspective view and cross-sectional view of FIGS. 13 and 14, and the page member is wound up. An axis is formed.

In addition, when using this winding shaft, as described above, the page sheet identification holes 137, 144, and 14 are
Since the numbers 5 and 5 match, a page sheet member in which the base sheet 141 is cut along the cutting lines ○A...○A in FIG. 6 and the page sheet identification holes 144 and 145 are removed may be used. In view of the strength of the base sheet 141, etc., it is more effective to obtain a highly reliable identification signal.

An example of how to assemble this page switching mechanism is to first directly install the holding plate 113 with the pulleys 107, 108, 109, etc. attached to the board 114, and then insert the drive shaft 92 into the insertion hole 131 of the holding plate 113 (for example, the gear 103 (attached after insertion). Also, roller 11
5, 116, 117 as the drive shaft 9
2 (gears 104 and 105 are meshed), and electric motors 100 are mounted on both ends of the substrate 114 so that the drive shaft 92 and the winding shaft 91 are rotatably supported.
Holding plates 111 and 112 are provided, to which the holding plates 111 and 112 are attached. After that, the guide plates 10 and 12 are attached to the base plate 114 and the slit 129 between the holding plates 111 and 112, and the belt 93 is attached to the pulleys 106, 107, 10.
The first
The page switching mechanism shown in Figure 0 is obtained.

The multi-item information input device according to the present invention is constructed by installing this page switching mechanism inside the housing as shown in FIG.

Next, FIGS. 10 and 15 to 19 show page selection operations of the Honda item information input device described above.
This will be explained with reference to the figures. In this figure, the same reference numerals as those mentioned above represent the same contents. First, regarding the winding operation of the page sheet member 14, first, the desired page sheet member 14 is rolled up into the second page sheet member 14.
As shown in the figure, the base sheet 141 is inserted into the guide passage 13 through the exchange port 4, and the connecting pin 142 of the base sheet 141 is brought into contact with the winding shaft 91, so that the winding is possible.

Next, when the predetermined push button switch 5 of the page selection key group A corresponding to the selected page sheet 140 is pressed and switched, the electric motor 100 is automatically driven and the gear 102 is rotated as shown in FIG. It is transmitted to the gear 103 via the belt 119, and as a result, the drive shaft 92 rotates by a predetermined angle in the direction of arrow a. Also, when the drive shaft 92 rotates in the direction a, the one-way clutch 98 moves in the direction a.
Gears 104 and 105 rotate synchronously only in the direction.
The winding shaft 91 is rotated by a predetermined angle in the opposite direction of arrow b.

At this time, the belt 93 does not rotate because the one-way clutch 99 is set to idle when rotated in the direction a. Then, b of the winding shaft 91
As the page sheet member 14 in FIG. 2 rotates in the direction, the page sheet member 14 in FIG.
It is wound onto a winding shaft 91 as shown in the figure. Further, when the rotation of the winding shaft 91 by a predetermined angle in the b direction is completed, the desired page sheet 140 is set in a state in which only the other end surface is latched to the guide plate 11, as shown in FIG.

Next, from this state, the electric motor 100 is automatically driven to reverse rotation, and the drive shaft 92 rotates in the direction of arrow c as shown in FIG.
Along with this, the belt 93 rotates in the directions of arrows e and f, transmitting the rotational power of the drive shaft 92 to the winding shaft 91, rotating the winding shaft 91 in the direction of the arrow g, and printing the desired page. The sheet 140 is sent out in the direction of arrow m, and the other hedge sheets 140 are sent out in the direction of arrow n.

At this time, since the one-way clutch 98 is set to idle when the drive shaft 92 rotates in the c direction, the rotational power of the drive shaft 92 is transferred to the gear 10.
No transmission occurs from gear 4 through gear 105.

When the rotation of the winding shaft 91 by a predetermined angle in the g direction is completed, the desired page sheet 140 is sent out onto the guide plate 75 over each push button switch 45 of the input key group B, and a function display is given to each push button switch. ,
And the other page sheet 140 is the guide passage 13
The page selection operation is completed.

Further, when the other push button switch 5 of the page selection key group A is pressed from the state shown in FIG. 17, the winding shaft 91 moves to the gear 104, as shown in FIG.
105 automatically rotates the guide plate 7 by a predetermined angle.
After winding the desired page sheet 140 on page 5, the designated desired page sheet of this time is set as shown in FIG. In this case, the page of the desired page sheet 140 is selected as shown in FIG.

Next, the page sheet member 1 is wound around the winding shaft 91.
The exchange operation of No. 4 will be explained.

When replacing the page sheet member 14 in the state shown in FIG. 17, first the push button switch 5 dedicated to page sheet member replacement in the page selection key group A is switched. Then, similar to the above, the winding shaft 91
is automatically rotated by a predetermined angle as shown in FIG. 15, and after passing through the winding state, it is set to the state shown in FIG. 18. FIG. 18 shows a state in which the other end surface of the first page sheet 140' has passed through the guide plate 11 and is located in the guide passage 13, and the other end surface of the last page sheet 140'' is locked to the shaft 94. This is possible because, as explained in FIG. 5, in this page sheet member 14, one page sheet is removed between the first page sheet 140' and the last page sheet 140'' when the page sheet member 14 is wound. It will be done. And the first
From the state shown in FIG. 8, the winding shaft 91 is driven to rotate in the opposite direction by the belt 93 as shown in FIG. 17, as shown in FIG.
The page sheet member 14 is discharged into the guide passage 13 and returns to the winding operation state shown in FIG. 2. In this state, one end of the page sheet member 14 can be led out from the exchange port 4 and removed by the operator.

In this way, in this embodiment, the page sheet member 1
When the page sheet member 4 is wound up, the page sheet member 14 is always pressed from the outer periphery by the belt 93, so when the winding shaft 91 rotates, the page sheet member 14 is wound tightly by the frictional force of the belt 93, and no loosening occurs. On the other hand, even when sending out the page sheet member 1
4 receives a feeding force from the outer circumferential direction by the belt 93 and rotates the winding shaft 91, so that the winding shaft 91 receives a tightening force and can be delivered without loosening. Furthermore, since this operation is realized by forming two closed power transmission paths using one electric motor, the page switching mechanism is small, compact, consumes little power, and is inexpensive. Further, in this embodiment, the diameter ratio (pulley ratio) between the pulley 106 and the roller 117 is larger than the tooth number ratio (gear ratio) between the gears 104 and 105, and the page sheet member 14 is wound around the winding shaft 91. When completely wound (winding shaft 9
1 becomes thicker due to the page sheet member), the ratio between the two is set to be approximately equal to 1:1.

By setting the pulley ratio and gear ratio in this way, the diameter of the winding shaft 91 containing the page sheet member 14 becomes gradually thinner when the page sheet member 14 is fed out, so that the rotational speed of the winding shaft 91 is controlled by the drive shaft. 92
, and this winding shaft 91
The rotational power is transmitted from the gear 105 to the gear 104, and the gear 104 rotates in the same direction as the C direction of the drive shaft 92, and the rotational speed of the gear 104 is similar to that of the drive shaft 92 as well as the winding shaft 91. Try to be faster.

However, since the state in which the rotational speed of the gear 104 exceeds the rotational speed of the drive shaft 92 is a condition for causing the one-way clutch 98 to rotate synchronously, the rotational speed of the winding shaft 91 is ultimately determined by the gear ratio.

Therefore, the difference in power transmission speed between the winding shaft 91 and the belt 93 when the page sheet member 14 is fed out is avoided by the belt 93 slidingly rotating on the page sheet member 14, and as a result, the page sheet member 14 is The feeding operation is performed while a force in the winding direction is applied.

In this way, due to the relationship between the pulley ratio and the gear ratio, a part of the rotational power of the belt 93 is converted into the winding force of the page sheet member 14 during feeding, so that the winding shaft 91 is prevented from rotating at high speed, stopping suddenly, and starting suddenly. Even if the winding does not loosen, it will never loosen, and even if an initial winding failure occurs, it will self-repair.

In the present invention described above, as shown in FIG. 10, a belt 93 for holding down the wound page sheet member 14 is installed approximately at the center of the winding shaft 91. As a result, as shown in FIG. 16, the next page sheet after the desired page sheet 140 is
3) Since the page sheet is held at one point in the center, it is possible to securely release or hold the page sheet, and since the page sheet member is sent out using one belt 93, there is no need for variations in belt rotational speed as in the conventional case. Since the page sheets are not distorted or misaligned, stable page sheet selection operations can be achieved.

In the above embodiment, a case has been described in which the present page switching device is applied to a multi-item information input device, but the present invention is not limited to this and can be easily applied to, for example, a display switching device that selectively switches display sheets. can. Further, in the above embodiment, a desirable example was shown in which two power transmission paths were formed using one electric motor, but naturally two electric motors were used to form the belt 9
3 and the winding shaft 91 may be rotated separately.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a multi-item information input device according to the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIGS. 3 to 7 are diagrams for explaining a page sheet member according to the present invention. 8 and 9 are explanatory diagrams of a page sheet identification signal generation circuit and its operation according to the present invention, and FIGS. 10 to 14 are diagrams for explaining the structure of a page switching device according to the present invention. , FIGS. 15 to 19 are diagrams for explaining the operation of this page switching device. [Explanation of symbols], 9...Page switching mechanism, 91
... Winding shaft, 92 ... Drive shaft, 93 ... Belt, 9
8,99...One-way clutch.

Claims (1)

[Scope of Claims] 1. A winding shaft for winding up a plurality of page sheets so that their tips are spaced apart by a certain distance, a drive shaft for rotating the winding shaft, and a winding shaft for winding up the wound page sheets. It has an endless belt for holding down the winding shaft that goes around the winding shaft and spans the drive shaft to hold the winding shaft in the above-mentioned state. What is claimed is: 1. A page sheet switching device that selects and sends out a desired page sheet by moving the page sheet, wherein only one endless belt is installed approximately at the center of the winding shaft. 2. The page switching device according to claim 1, wherein the page switching device is used as a page switching mechanism of a multi-item information input device.